sap green

Art : A pigment obtained from the juice of blackthorn berries, which are first fermented in a tub for eight days, and then placed in a pre with a small quantity of alum, and concentrated by gentle evaporation; it is afterward hardened by inclosure in bladders. It is used in water-color painting, but is of no real value. sap-rot, s. Dry-rot (q. v.). sap-spout, subst . A device for conducting sugar maple sap from the tap-hole to the bucket. sap-tube, s. A ve el for conducting sap.